JP6634215B2 - Concrete block - Google Patents

Description

  The present invention relates to a concrete block used, for example, for pavement or construction.

  2. Description of the Related Art Conventionally, a heat-shielding block that increases the solar reflectance of a block surface to reduce the temperature and heat storage of the block surface has been known (see Patent Document 1).

  Such a heat-shielding block contains white cement, a heat-insulating pigment, and a white aggregate, and is manufactured so as to have a lightness (L value) of 30 to 60 and a solar reflectance of 40% or more.

JP 2012-206866 A

  However, such a heat-insulating block can suppress an increase in the surface temperature of the block to some extent, but is expensive because a heat-insulating pigment is used.

  An object of the present invention is to provide a concrete block capable of sufficiently lowering the temperature of the block surface without using a thermal barrier pigment.

The invention according to claim 1 is a concrete block which does not contain a pigment and is composed of an aggregate and cement. The aggregate includes an aggregate having a solar reflectance of 35% or more and a weight of 50% based on the total weight of the aggregate. % by weight or more, the surface of the concrete blocks, over substantially the entire area, the exposed surface of the aggregate, and wherein the solar reflectance of 30 percent or more.

  According to the present invention, the temperature of the block surface can be sufficiently reduced without using a thermal barrier pigment.

It is sectional drawing which showed that a block main body was washed out and a concrete block was formed. It is the top view which showed the concrete block. It is sectional drawing of the concrete block shown in FIG. It is sectional drawing which showed that the surface of the block main body was grind | polished and a concrete block was formed. FIG. 4 is a cross-sectional view showing that a concrete block is formed by performing shot blasting on the surface of the block body.

  Hereinafter, an embodiment which is an embodiment of a concrete block according to the present invention will be described with reference to the drawings.

[Example 1]
As an aggregate, white cement and water are kneaded with an aggregate having a solar reflectance of 43.6% (first aggregate) and a black aggregate (second aggregate) having a solar reflectance of 10.3% in a mixing ratio shown in Table 1. Then, after being molded and washed out by a vibration press, the product was cured, and Example 1 was produced. The aggregate and the black aggregate are natural stones, but are not limited thereto.

[Example 2]
As an aggregate, white cement and water were mixed and kneaded with an aggregate having a solar reflectance of 35.2% at a compounding ratio shown in Table 2, and after shaping after shaping by a vibration press, curing was carried out to prepare Example 2. .

[Example 3]
As an aggregate, an example in which ordinary Portland cement and water were kneaded with an aggregate having a solar reflectance of 35.2% at a mixing ratio shown in Table 3, cured by shaking with a vibration press, and then subjected to surface blasting by shot blasting. 3 was produced.

[Example 4]
As an aggregate, white cement and water are kneaded with an aggregate having a solar reflectance of 43.6% (first aggregate) and a green aggregate (second aggregate) in a mixing ratio shown in Table 4, and molded by a vibration press. After the post-washing-out process, curing was performed to produce a concrete block similar to that of Example 1. The aggregate and the green aggregate are natural stones, but are not limited thereto.

[Comparative example]
As an aggregate, an ordinary portland cement and water were kneaded with an aggregate having a solar reflectance of 35.2% at a mixing ratio shown in Table 3, and a test body in a non-processed state was prepared after being molded by a vibration press and cured.
[Indoor irradiation test]
The prepared test piece was irradiated with a beam lamp “BRF110V / 150W” manufactured by Toshiba Lighting & Technology Corporation for a predetermined time, and the surface temperature was measured. The comparative specimen was dense-grained asphalt.

  As shown in the irradiation test results in Table 5, the surface temperature of Example 1 was 45.6 ° C. when the surface temperature of the fine-grained asphalt was 60 ° C., which was 14.4 ° C. lower than that of the fine-grained asphalt.

(Table 5) Results of indoor irradiation test of Example 1

Further, as shown in Table 6 of the irradiation test results, the surface temperature of Example 2 was 41.8 ° C. when the surface temperature of the fine-grained asphalt was 60.1 ° C., which was 18.3 ° C. lower than that of the fine-grained asphalt.
(Table 6) Results of indoor irradiation test of Example 2

  As shown in Table 7 of the irradiation test results, the surface temperature of Example 3 was 46.1 ° C. when the surface temperature of the fine-grained asphalt was 60.4 ° C., which was 14.3 ° C. lower than that of the fine-grained asphalt.

  Comparing Example 3 with further scratching and Comparative Example 1 without processing, the surface temperature of the unprocessed product was 49.1 ° C. when the surface temperature of the granular asphalt was 60.4 ° C., and Example 3 was better. The result that the surface temperature was low at 3 ° C was obtained.

(Table 7) Results of room irradiation test of Example 3

As shown in Table 8 of the irradiation test results, the surface temperature of Example 4 was 44.8 ° C. when the surface temperature of the fine-grained asphalt was 60.3 ° C., which was 15.5 ° C. lower than that of the fine-grained asphalt.
(Table 8) Results of indoor irradiation test of Example 4

[Solar reflectance]
The solar reflectances of the test pieces of Examples 1 to 3 and Comparative Example are as shown in Table 9.

From the results of each test, it is necessary to use aggregates with a solar reflectance of 35% or more as raw materials without using expensive heat-shielding pigments, and to perform processing such as scratching or washing out the aggregates on the concrete block surface. Thus, by exposing the aggregate on the surface, it is possible to provide various design properties according to the aggregate to be used, and it is possible to sufficiently suppress the temperature rise of the concrete block surface.

  By the way, the processing method of exposing the aggregate on the block surface includes various processing methods such as a washing process, a scratching process (shot blast process, spiral process), and a polishing process, but a process capable of exposing the aggregate. Any processing method may be used.

  Furthermore, in Example 1, a black aggregate is used.However, since it can be used at a certain ratio or more with an aggregate having a solar reflectance of 35% or more, the color of the aggregate used is not limited to black. Other colors may be used.

Therefore, by changing the color of the aggregate or the method of processing the surface, the surface temperature can be suppressed and concrete blocks of various designs can be manufactured. In addition, since an expensive heat-shielding pigment is not used, a concrete block excellent in cost performance can be manufactured accordingly.
[Example 5]
FIG. 1 shows a concrete block 60 according to a fifth embodiment. The concrete block 60 has a surface portion 60B formed by kneading a white cement Wb1 and an aggregate Wb2 on a concrete base portion 60A. The surface layer portion 60B is formed such that the aggregate Wb2, the white cement Wb1, and water are formed in the mixing ratio shown in Table 2. The aggregate Wb2 is, for example, a natural stone having a solar reflectance of 35% or more.

  The white cement Wb1 on the surface of the surface portion 60B is washed down by, for example, washing with water. As a result, the aggregate Wb2 at the upper portion of the surface portion 60B is exposed, and the aggregate Wb2 at the upper surface becomes the exposed surface portion 60C, and the concrete block 100 shown in FIGS. 2 and 3 is formed.

  The surface layer portion 60C of the concrete block 100 has the same characteristics and effects as the concrete block of the second embodiment.

  In the fifth embodiment, the surface portion 60C is formed by the washing process, but may be formed by dispersing the aggregate Wb2. That is, after forming the surface layer portion 60B, the aggregate Wb2 is scattered on the surface layer portion 60B, and is pressed from above while being vibrated by a press die to form the surface layer portion 60C.

The concrete block having the surface portion 60 </ b> C formed by the dispersal has the same characteristics and effects as those of the concrete block 100 of the fifth embodiment. That is, here, the dispersing step is also included in the processing method for exposing the aggregate.
[Example 6]
FIG. 4 shows a concrete block 200 according to the sixth embodiment. In this concrete block 200, a surface layer portion 60B composed of a white cement Wb1 and an aggregate Wb2 is formed on a base layer portion 60A as in the fifth embodiment, and the surface layer portion 60B is polished (exposed). By this polishing, the white cement Wb1 on the surface of the surface portion 60B is removed, and the aggregate Wb2a on the upper portion of the surface portion 60B is exposed and polished to form the surface portion 60D, and the concrete block 200 is formed. .

This concrete block 200 can also obtain the same characteristics and effects as those of the third embodiment.
[Example 7]
FIG. 5 shows a concrete block 300 according to the seventh embodiment. In this concrete block 300, a surface layer portion 60B composed of ordinary Portland cement Wb3 and an aggregate Wb2 is formed on a base layer portion 60A in the same manner as in the fifth embodiment, and shot blasting (scratch treatment) is performed on the surface layer portion 60B. Then, the concrete block 300 is formed by changing the surface portion 60B to the surface portion 60F.

  In this shot blasting, the steel shot balls 70 collide with the surface layer portion 60B, and by this collision, the ordinary Portland cement Wb3 on the surface of the surface layer portion 60B is removed, and the shot blasting process is located above the surface layer 60B. As the aggregate Wb2b is exposed, the exposed aggregate Wb2b is scratched K, and the surface layer portion 60F is formed. Thus, a concrete block 300 is formed.

  This concrete block 300 can obtain the same characteristics and effects as the concrete block of the third embodiment.

  Since the concrete blocks 100 to 300 of Examples 5 to 7 do not use any pigment, the same effects as those of Examples 1 to 4 can be obtained.

  In the seventh embodiment, the steel shot ball 70 collides with the surface layer portion 60E to scratch the surface of the aggregate Wb2b. However, the present invention is not limited to this. For example, the surface of the surface layer portion 60B is hit or cut with a blade. The scratch K may be generated on the surface of the aggregate Wb2b by taking.

  In each of the fifth to seventh embodiments, one kind of aggregate Wb2 is used. For example, if two kinds of aggregates are used as in the first embodiment, the same effect as in the first embodiment can be obtained. Can be. Further, the concrete blocks 100 to 300 of Examples 5 to 7 are each composed of two layers of the base layer 60A and the surface layers 60C, 60D, and 60F, but may be composed of one layer or three layers. You may comprise with the above-mentioned multilayer.

  The present invention is not limited to the above embodiment, and changes and additions of the design are allowed without departing from the gist of the invention set forth in the claims.

60A Base Layer 60B Surface Layer 60C Surface Layer 60D Surface Layer 60E Surface Layer 60F Surface Layer 100 Concrete Block 200 Concrete Block 300 Concrete Block Wa Base Layer Wb Surface Layer Wb1 White Cement Wb2 Aggregate Wb3 Ordinary Portland Cement K Wound

Claims (4)

A concrete block that does not contain a pigment consisting of aggregate and cement,
The aggregate contains an aggregate having a solar reflectance of 35% or more, and 50% or more based on the total weight of the aggregate,
The aggregate corresponding to the remaining ratio is a colored aggregate,
A concrete block, wherein the surface of the aggregate is exposed over substantially the entire area of the concrete block, and the solar reflectance is 30% or more. A concrete-free concrete block having a concrete base layer and a surface layer formed on the base layer,
The surface portion is made of aggregate and cement,
The aggregate contains an aggregate having a solar reflectance of 35% or more, and 50% or more based on the total weight of the aggregate,
The aggregate corresponding to the remaining ratio is a colored aggregate,
A concrete block, characterized in that the surface of the surface layer is substantially exposed to the surface of the aggregate over substantially the entire area and has a solar reflectance of 30% or more.   The concrete block according to claim 1 or 2, wherein the aggregate is a mixture of a first aggregate having a high solar reflectance and a second aggregate having a low solar reflectance.   The concrete block according to claim 3, wherein the first aggregate has a solar reflectance of 35% or more, and the second aggregate has a solar reflectance of 10% or more.